Graphs
This "f" word is the statistical term "count" or "tally". It's often used to label the vertical axis of a histogram.
What is frequency.
Also known as the average
What is mean
The Max-Min or the [start, stop] of the data
What is range.
It's how we compute the whisker boundaries in a boxplot.
Q1 - 1.5*IQR
Q3 + 1.5*IQR
What is a population?
The entire collection of people or entities of interest.
This simple graphical display is the categorical equivalent of a histogram
What is a bar plot.
Some refer to this measure as the "middle number."
What is median.
3Q-1Q
What is interquartile range.
Their the 5 summary values present in a boxplot
(min, 1Q, med, 3Q, max)
What is the difference between a population and a sample?
A population is all people or entities of interest. A sample is a subset of the population.
This graphical display is a five number summary.
What is a boxplot.
No value has more occurrences than the result of this statistic.
What is mode.
75% of data items are below this value.
What is a third quartile.
What are the quartile boundaries for 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
What 3 (Q1), 6 (Q2), and 9 (Q3)
A proposal before the state parliament would increase the gasoline tax. The additional money would be used to improve the state's roads. Some state legislators are concerned about voters' opinions. To gain this information, they randomly select 1,009 registered voters and ask them if they favor the additional tax. What is the population?
all the registered voters in the state
This graph divides a circle into proportions showing the percentage of each result.
What is a pie chart.
An outlier can have a huge effect on this measure of center.
What is mean.
At least 68% of data falls within this.
One standard deviation of the mean in a symmetric distribution.
This type of visualization is a picture of your distribution.
What is a histogram
A proposal before parliament would increase the gasoline tax. The additional money would be used to improve the state's roads. Some state legislators are concerned about voters' opinions. To gain this information, they randomly select 1,009 registered voters and ask them if they favor the additional tax using a 1 thru 5 scale with 1 being "not in favor" and 5 being "strongly in favor". What type of variable is this?
What is categorical and ordinal
The interquartile range is clearly displayed on this graph.
What is a boxplot.
This number is the median of 10, 8, 6, 1, and 2
What is 6.
These type of data values exist outside of the whiskers on a box plot
What are outliers.
This data set has a boxplot without whiskers.
What is 111111222222
A proposal before parliament would increase the gasoline tax. The additional money would be used to improve the state's roads. Some state legislators are concerned about voters' opinions. To gain this information, they called every third person listed in the phone book. Is this a valid sample? Why or why not?
No, because the people in the phone book are not all voters